Programmers are not to be measured by their ingenuity and their logic but by the completeness of their case analysis.

One man's constant is another man's variable.

To understand a program, you must become both the machine and the program.

Any noun can be verbed.

In man-machine symbiosis, it is man who must adjust: The machines can't.

Adapting old programs to fit new machines usually means adapting new machines to behave like old ones.

One can only display complex information in the mind. Like seeing, movement or flow or alteration of view is more important than the static picture, no matter how lovely.